Paper cutter



F. W. SEYBOLD Oct. 9, 1951 PAPER CUTTER 12 Sheets-Sheet 1 Filed May 31, 1946 INVENTOR. FREDERICK 14 SEVBOLD ATTORNEYS F. W. SEYBOLD PAPER CUTTER Filed May 51, 1946 12 Sheets-Sheet 2 INVENTOR. FREDER/CK W SEVBOLD ATTORNEYS O 1951 F. w. SEYBOLD 0,

PAPER CUTTER A T TORNE VS Oct. 9, 1951 F. W. SEYBOLD PAPER CUTTER 12 Sheets-Sheet 4 Filed May 31, 1946 V INVENTOFR. FREDERICK w SEVBOLD ATTORNEYS Oct. 9, 1951 w, SEYBQLD 2,570,873

PAPER CUTTER Filed May 51, 1946 12 Sheets-Sheet 5 INVENTOR. FREDERICK w SEVBOLD MYflu A T TORNE VS F. W. SEYBOLD Oct. 9, 1951 PAPER CUTTER 12 Sheets-Sheet 6 Filed May 31, 1946 INVENTOR.

FREDER/CK W.

SEVBOLD WWZJV ATTORNEYS Oct. 9, 1951 F. W. SEYBOLD PAPER CUTTER '12 Sheets-Sheet '7 Filed May 31, 9

w m w m FEEDER/CK l V. SEVBOLD ATTORNEYS 0a. 9, 1951 F, w, SEYB LD 2;570,s73

PAPER CUTTER 12 Sheets-Sheet 8 Filed May 51, 1946' q INVENTOR.

FRED'R/CK W SEVBOLD BY M WM ATTORNEYS F. W. SEYBOLD Oct. 9, 1951 PAPER CUTTER 12 Sheets-Sheet 9 Filed May 31, 1946 INVENTOR. FREDERICK W. SEVBOLD .MQM

A T TUBA/E 1 5 F. W. SEYBOLD PAPER CUTTER l2 Sheets-Sheet 10 Filed May 31, 1946 INVENTOR. FREDERICK W. SEVBOLD ATTORNEYS F. w. SEYBOLD PAPER CUTTER l2 Sheets-Sheei 11 Filed May 31, 1946 INVENTOR. FREDERICK M4 SEYBOLD Wmiu ATTORNE KS F. W. SEYBOLD PAPER CUTTER 12 Sheets-Sheet 12 Filed May 31, 1946 MMN INVENTOR. FREDERICK w SEI BOLD MWN WWZIZQ ATTORNEYS UNITED STATES PAPER CUTTER Frederick-W.-' Seybold; Wes'tfi'eld, Nt- J, assignorto E'.'-R. Lawson-00., 110., NewaYorkeN..Y;,.a1 corporation ofeNew York V 7 Application May 31; 1946, SerialNo; 673289 57 "Clain1s.' 1.

My'present invention relates: to paper cutting mechanisms and more particularly" toanovel guillotine type paper cutter which includes'a clamping mechanism, the pressure of which is controlled by the reactive force of the knife going; through the paper stack. Since the clamping; pressure is thus automatically controlled and therefore permits the continued use of the'knife as -it-become duller, my cutting machine also 7 inually operated adjustments were-provided to vary *thecompression of the V clamping springs or.

the-pressure of theh-ydraulic-mechanism. All of these-prior adjustments were -made by the operatorbefore cutting-and were based on the- D- erators judgment or instructions."

The' various factors-which influence the desirab1e-= clampingpressure which-is to be obtained'are 1. t The height of the paper pile-"on the cutting table:-

2-: The nature of the stock inthe pile,- and 3. The;re1,ative sharpnessof 1 the knife In addition to these major factors, other minor stockyminute canting of the knife owing'to Wear ando ther -elements well known in the art also influence the desirable clamping pressure.-

While an'operator may readily make an ad-- justment=- of clamping-pressure with-respect to the height of th-e p-ile and the generarnature ofthe s-tock' being cutfollowing-general instructions for this purpose, the-priorartprovidedfcifth most part only a very rough adjustmentf for clamping pressure? Askilled-operator-might"also make an adjustment for therelative=sharpness =of the knife based on his-'k'nowledge of the mach'ine' and the length of time-the machine' liasbeen used since the knife was l'ast sharpened-, but this cludes a novel-safety mechanism and an over- 10. was-a= rule of thumb adjustment and such ad- I loadirelease device together with other elements justment-oftlie clampingpressure for this' -purfacilitatingthe operation of the clamp and the pose-wasimpossible-where the adjustment si'mknife. ply consisted of using one', two or three springs Essentially in-mycutti-ng machine; my clampto vary clamping-pressure.- ing mechanism derives the major portion of its The primary object-ofmy invention is the proclamping pressure; from'the'resistance which the vision ofclamping meclianismwhich-will-auto eam l inicutting t ough the pap p maticallyand without the -i-ntervention' of the" andfthe .minor portion of the clamping presoperator or adjustment by him 'apply'exactl'y the sure'is derived from a compression spring. correct clamping pressure required for all of'the' Heretoforev in the Operat o f Cutting conditions occurringat' the time-the'cut ismade. chines,;particularly of the-gui1lotine type, which A- furtheri'objectof'my invention is the provi--= t ega 'clampifor compressingtt e p p r Sta sion -of clamping 'mechanism which will apply justopriorrto themovementof'the knife into-the clamping pressure which is infinitely-variable 5 .9%? stackiclamping p r as Obt ned D' over'a-predetermined-rangeand whichwill 'apply mari-ly bya single-compression spring or set of the proper clamping pressure in responseto'the ompression'Spri e ergy of which conditions which-occur at=thetimeof thecutt was utilized to forcethe" clampdown; Alsoin Tocar'ryout these-objects, my'invention pr somepriordevicesclamping pressure; was obvides for a compression spring which cauSes tained hydraulically or by friction-devicesi clamp to apply an 'initial -minimum clamping Where, however it was desired to make thepressure t th t k, 7 clamping"pressureadjustable; thenmeans-were deviceis further arrangedflso,thabyasfithe provided for vary gthe amount of comp knife enters the--stack"and begins to go through O t e Springs These means included utilizait, the resistance encountered-by the kni-fe will tion ofa. number 'Of S11E11' O D 'G SSiO Sp increase the clamping-pressure in" accordance- 8 more Of h Canibe disconnected'by'the V with said resistancee Thus no adjustment need operator toreduce-theolamping pressure or man-* be'made =by the operator in' going 'from one type of stock to another'type of stock or for' variations' in the h'eight'of the pile'or for the dullnes's' knife-*may-become'sodull that the reactive force of the -knife 'on the clamp-as the k'nif through the-stack -may-become so great brea-h some of the mecha'nism, a further 'objet' of my'invention is the provision of-a novel over load release device which will releaseethe knife factorssuch asvariationsin quality of the Same cutting mechanism in .the event'that; -theknife encounters too=great airesistance going through th'e stack. This will protect the machine notonly a ainst :excessive dullness of the knife, "but zalso against any accidental bindingor jammingthat may occur and also ag-ainst the accidental-fin 3 clusion of improper material in a stack which is being cut.

Thus a further object of my invention, is the provision of novel clamping means which will apply proper clamping pressure independently of the judgment of the operator of the machine as to any of the variables involved.

A further object of my invention is the pro- 'vision of novel safety mechanism.

Still another object of my invention is the provision of novel drive means for the clamp and for the knife.

A further object of my invention is the provision of novel guide means for the clamp which will protect the paper stack and the knife.

Still another object of my invention is the provision of novel adjusting and guide means for the knife.

These and many other objects of my invention will become apparent in the following declamp operating mechanism. Figure 5 is a top View of the paper cutter showing the operating mechanism generally.

, Figure 6 is a detail view in cross-section taken on line 56 of Figure 4 showing details of a portion of the clamp operating mechanism.

. Figure '7 is a detail view corresponding to that of Figure 5 and taken on line of Figure 3 showing further clamp operating details.

; Figure 8 is a detail View of the throw-in and throw-out mechanism for operating the knife.

Figure 9 is a detail of the knife guide means and is an enlargement of a portion of Figure 5.

Figure 10 is a front elevation of the left-hand upright housing.

Figure 10a is a section taken on line |0a-||1a of Figure 10.

Figure 11 is an enlarged detail View of a portion of Figure 5 showing the fly-wheel arrangement and clutch members.

Figure12 is a further detail view of the mechanism of Figure 11.

Figure 13 is an'enlarged detail showing additional clutch operating elements.

Figure 14 is an enlarged detail view taken from.

line |4|4 of Figure 13.

Figure 15 is a view taken on line |5--|5 of Figure 12 looking in the direction of thearrows. Figure 16 is a front view of the braking mechanism and overload release mechanism shown in the lower center of Figure 7 and taken on line |6.|6 of Figure 7.

Figure 1'7 is a view taken on line of Figure 16.

Referring to Figure 1, the machine has a column casting H! which contains and houses the driving mechanism; Two upright housings II and I2 are fastened on top of column l0. They are spaced apart a distance equal to the width of the table l3. This table is a support for the pile of paper to be out.

- In the following description, Figures 3 and 4 show primarily the clamping mechanism omitting the knife operating mechanism for the sake of clarity. The knife and knife operating mechanism are shown in Figures 1 and 2. The relationship in space and function of the clamp and p 4 knife members are shown in Figure 5 as well as in the common elements of Figures 1 to 7.

CLANIPING MECHANISM The clamp |4 (Figures 3 and 4) is positioned approximately six inches above table 13. Clamp M is provided with extensions I5 and 16 to which on either side are connected, by meansv of pins H, H, the vertical pull bars l8, l8. These pull bars l8 are connected respectively at the lower ends to pins IQ of the bell cranks 2|) and 2| on opposite sides. Bell cranks 20 and 2| are connected to the horizontal rod 22 by connecting pins 23 and 24 to keep the movement of the clamp l4 parallel to the table.

The bell crank 20 is free to oscillate on the shaft 25 and the bell crank 2| is free to oscillate on the shaft 25. These shafts are secured in the column casting II).

In order to make it possible for the clamp M to be depressed or lowered toward the table by means of foot pressure, to be described later, the following mechanism is provided:

Referring to Figures 3 and 4, two vertical rods 2'7, 27 are connected to the swivels 28 by means of pins 29 and are supported on pins 30 which are fastened to column casting Ii). The upper ends of rods 2'1, 2? pass through holes in the extensions |5 and |5 of the clamp l4. Washers 32 bear against the lower side of extensions l5 and H5. Springs 33, guided on rods 21, are compressed between the swivels 28 and. the washers 32 and in this manner support the weight of the clamp I4 and return the clamp to its uppermost position when foot pressure is released.

PEDAL OPERATION OF CLAMP Foot treadle 34 is fulcrumed on a pin 35 which is carried in a bracket 36 which is fastened to the column casting I0 (see also Figures 5 and '7). The treadle 34 is held in position on pin 35 b washer 46 and cotter pin 41. Foot treadle 34 has a boss 31 with a pin 38. A chain 39 is connected to pin 38, and this chain is run over a sprocket which is free to turn on a pin 4|, which in turn is fastened or driven into column casting Ill. The other end of the chain 39 is connected to a block 42 which bears against the pin 23. The block 42 is also connected to one end of tension spring 43, the other end of which is secured to the adjusting stud 44 which is secured by means of the nut 45 to the column casting It).

It can therefore be seen that when the foot depresses the treadle 34, the downward movement of said treadle-will pull down chain 39 extending spring 43 and pushing block 42 against pin 23; this will therefore turn the bell crank 2| in a counterclockwise direction. Since bell crank 20 is connected by red 22 to bell crank POWER. OPERATION OF CLAMP The vertically slotted link 55 is suspended from the bell crank 25 by pin 54 which passes through slot 5| in link 50. Pin 54 is mounted on bell crank lever 20 and is coaxial with pin IS. The lower end of link carries a bore and needle bearing 52 which fits over the crank pin d ,4 s, s i 53 i carried. y e two cla p gears 55 (see3f and 4 and especially Figurefiflwhich'turfi on the shortsh'afts 56. "Shafts 56""are slecuredtothefplates 5Tand '58. j 'fPlatesj 5'1; andf58'; areffree to turn on bearings ligdffifie' provided "onthelong' double pinion 59." Phiion 591s freeto rotate onthe crank shaft 60' whichis journall'ed oh"Timken' bearings" 6| and 62 (see also Figure'l)" which are fitted into'bores' pro'videdin" thef'co-lurnn casting ill. The plates 51 a dj 58f arespaced apart by, shouldered shaft 63 a fdft his s-haftjh as an extension fi l'on which, the pinion '65fc'anturn freely; This pinion 65 mesheswith'the long jdoublef pinion' 591 and the mternal "gear '56, the latter bein'g'fkeyed to the crank shafthflby means of the nose key 5?.

Thelarge gear 68 is keyed to; thedouble pinion 53 bfmeansof theke 69. The clamp gears 55 sh withthe smallerdiameter teeth Sea on thejdoiibleip-inio-n 59;" Whemtlfe'large gear EBsis rotated by the apparatushereinafter described, it will drive the double pinion 55which'wil1 in turn operate the clampgears' 55, and the crank pin 53 willthen pull on the vertical bar 50 and turn the hell cranks and 2d so as to depress the clamp Hi until the clamp contacts a pile of paper which has been placed "on the table [3.

After contact has been made with the paper pilef'therotation of the b'ell cranks Z J and 2! will cease but the clamp gears 55 will continue tojrotacte"in response to further rotation of sea 68 and pinion 59 With the result that the plates 51 and 53, on which gears 55 are mounted, will conunence to turn about their hearings 59d and ss bh the'long douhle pinion 59; This rocking ziiv in ntl r the plates 5'! and 5 will continue until the crank pin 53 will pass through an extended line drawn fro-rnthe pin 54 (which iscoaxial with pind in the bell crank ZU) through t e center of shortshaft 5B. 1

Thereafter on continued rotations-f gear 83 throughjitsffull cycle the plates 5 and 53 Will return to their original position and then the continuedturning of the clamp gears 55 will re turnfthe pull barlafi to its uppermost original position and the clamp I4 will also bereturned to its uppermost'position dueto the pressureof the springs 33. V

The movement in a counterclockwise direction,

withr'espect to Figure 3, of the plates 51 and 58 is resisted by a large compression spring H3 (Fig ure 3) which is located across thelowermost part of the column casting H1. One end of the large compression spring i0 bears against the pivotll which'is'suspended from the pin I2, the latter being secured, in the column casting l0.

A guide rod 13, is threaded into the pivot H at Hand serves to support the coils of the spring 1Q;.."The other end of the large compression spring 'm brears against a pivot 15 and this pivot is provided with trunnions 16. The latter are fulcrummed' in the ing arm 'il bolt 18,passes through the bore in the pivot 1,5 and is threaded into the guide rod 13." They rocking arm His fulcrummed onthe shaft 7-9 andv the upper end of the rocking arm'Tiis provided'iwith-"'pl'atestfif having "slots B'L' A connecting rod 82 connects the rocking arm I! with the plates 51 and 58 by means of the pin" 83 and the needle bearing 85; the opposite end of rod 8 zjbeing'connected by pin 8'4 to slots 8.! in

la es lowermost end ofthe rockn her eforebe seen that when th e plates 2 5 When the. clamp contacts the pil' of paper;

awe

EeQ QN QPERATI'IONOF-ICLANFB It .will, of course, require power to force the knife through this pile'o'f pap'erf Thedriiring power for the knife is derived from large" gear fifi which rotates pinion 59. Power is transmitted ternal gear 66. Internal geaffifiis'ke'yed'toand drives the crank shaft fifliwhich drives'theknife' elements as hereinafter described;

Therefore, the driving" torque reaction for the knife 'is taken" by the "shaft 63; whichcarries proportionto' the resistance that theiknife in its cutting'operation'. V

In 'bthi wbr'ds'fth harder the knife must Work to othrought the paper pile, the greaterfwill'be' thereaction force on the claniping mec anism 'fere'd to1the fknife in cutting will automaticallyv increase, the applied clamping pressure; This; avoids"thefnecessity for. using two' or] three" springs'jof the"type ,10 which would also have'tov 7 0,,

be adjusted 't'ofthepressure requirements". My

novel, construction thus automatically adjusts the I pressure to thedullness or sharpness, of the knife. s or r l Also it ,isknown that different grades of paper are; easier ltojj cut j tha'fi others with the sarne sharpness or dullness of the knife, and consequently the "pressure is always equal to that required in order to hold the paper securely without any adjustments of any kind on the spring or anywhere else. If the type of paper to be out is changed, there would have to be more tension on the springs whereas in my novel device such adjustments are not necessary.

My invention therefore avoids the necessity for complex and frequent minute adjustments for various paper stocks and for progressive variations in the sharpness or dullness of the knife and the resistance offered by the stock to the knife.

I The operator is thus not required to make an estimate based only on his own judgment as to the amount ofclamping pressure required for each operation. This is automatically done by the reaction to the force required to move the knife through the paper, the greater the force on the knife, the greater the reactive force resulting in greater clamping pressure.

Some adjustment, however,'is provided on the rocking arm 11". It has been mentioned that these plates are slotted and this makes it possible to move the pin and bearing 84 downwardly so that the amount of leverage is more favorable; that is, the amount of pressure transferred to the clamp I4 from the action of the compression spring 79 will 'be more. This adjusts only the initial squeeze, i. e. the effect of compression spring 19. The clamping pressure as a result of the resistance offered to the movement of the knife is not adjustable but is nevertheless automatically increased in proportion to the resistance offered to the knife movement. The total pressure is, of course, the sum of the pressure of spring 19 and the resistance to the knife movement so that decreasing the efiect of pressure offered by spring 19 decreases the total pressure applied to the paper.

CUTTING KNIFE CONSTRUCTION The knife 86 (Figures 1 and 2) is secured by means of a series of screws to the knife bar casting 81, and the latter is suspended on links 88, one at each end (see also Figure 5). The link 88 on the left-hand side is suspended from an eccentric pin 89. Pin 89 is journalled in the housing II. An arm 99 is fastened to eccentric pin 89 whereby when arm 99 is turned, the eccentric pin 89 will move the left end of, the left-hand link 88 up or down.

As the knife width is reduced through repeated grinding and sharpening, eccentric pin 891s used for adjusting the knife so that it will just cut through the, last sheet of paper.

The problem here is to maintain the knife blade always parallel to the cutting stick in a groove of table I3 so that an adjustment of only one end of the knife blade is necessary for this purpose. The adjustment of the knife in the left-hand side is controlled by this eccentric pin 89 whereas the levelling of the knife on the right-hand side is obtained by the lengthening or shortening of the pull bar 9| which is provided with right and lefthandthreads at its opposite ends threaded into the pivots 92 at its upper end and 93 at its lower end. The pivot 93 is fitted over crank pin 94 on crank 95, this crank being part of the crank shaft 69 .(see also Figure 8) The pivot 92 is secured by means of the pin 99 to the upper right-hand extension 91 of the knife bar 81. I

Therefore, when the crankshaft 69 rotates, the knife bar 81 will descend toward the table. Since it is pivoted on the two links 98, it will make a swinging movement toward the cutting stick in the table. The pull bar 9| is adjusted to the proper length so that the right-hand end of the knife will just cut through the last sheet of paper and the eccentric pin 89 is adjusted such that the left-hand end of the knife will also just cut through the last sheet of paper.

After the left link 88 has been properly adjusted on the left-hand side by means of the arm 99, the eccentric pin is then securely locked by a nut on the stud 99 affixed to housing I I. Stud 98 projects through a circular slot 99 of the arm 99. This slot 99 extends approximately over an arc of 180 so that the entire throw of the eccentric pin 89 becomes available.

The housings I I and I2 are connected by means of the upper beam casting I99 whereby a rigid arched construction is provided for the reciprocation of the'knife bar casting 81 as well as for the clamp M. This beam I99, of course, must be strong enough to resist the upward push of the links 88 whenever the knife cuts through the paper.

GUIDE MEMBERS Guide members for clamp Referring now to Figures 5, 19 and 10a, the extensions I5 and I9 of the clamp I4 are guided in vertical guides I9! in the housings I I and I2. Only the left-hand housing is shown in Figures 10 and 19a. The opposite guides have the same construction.

Each of the guides IN is a rectangular tubelike member which is enclosed on all four sides, the side I9 Ia directed toward the paper stack extending from the bed I3 of the machine to a distance above the bed slightly lower than the lowest edge of clamp I4 when the clamp is fully raised; the remaining sides of guide I91 extend to the top of the housing II. The portion of guide I9I above wall I9la is open at I9Ib to permit extensions I5 to pass into the guide I91 and move up and down therein. Guide I9I receives pull bar I8 as well as spring 33 and its guide rod 21. Wall I9 Ia prevents the pull bar I8 from contacting and disturbing or smearing the paper stack. Guide IOI on each side is provided with openings I22 and I23, I23 to permit inspection of the operation of pull bars l9 and springs 33.

Guide members for knife The knife bar 87 (Figure 9) is guided between the ways I92 which are part of the housings II and I2 and the ways I93 whichare adjustable by means of the wedge I94 in the housing cap I95 on the left-hand side and the housing cap I96 on the right-hand side (see Figures 5 and 9). Only the adjustment on the left-hand side is shown since the twosides are similar.

This adjustment is provided for the take-up of wear so the knife bar will always b a good fit in the ways I92. Screws II9 are provided on each side which'bear against the wedges I94 on each side; by tightening the screws H9, the wedges will force the guides I93 against the knife bar 91. The guides I93 are T-shaped and the .vertical part III of the T is guided in a groove or recess II2 of the housing caps I and each side.

Housings II and I2 are provided with doors H4 and H5 on hinges II6. Opening door/H5 I99 on permits access to lock nut I29 on pull bar 9I to adjust the pull bar length. Opening door drive shaft I30 is journalled in the long pinion I33, the head of which is provided witha ball bearing I34 mounted in a bore of the column casting 1.0. The pinion I33 meshes with the large gear 68 and whenever the drive shaft I30 rotates fit brings into motion the train of gearing described above for operating the clamp and the knife. a

CLUTCH OPERATION A fly-wheel I35 (Figures 5 and 11) is mounted a on ball bearings I36 around drive shaft I30'and this fiy-wheel is fre to rotate on these bearings. Fly-wheel I35 is driven by V- belts from a motor, not shown, engaging pulley I38 on extension I39 of the fly-wheel I35. A multipledisc clutch I45 (commercially available), the driving friction plates of which fit into interna1 gear teeth I56 shaped into-the fly-wheel is provided to connect the rotating fiy-wheel I35 to the drive shaft I; that is, whenever the clutch is engaged, the v fly-wheel I then begins to drive the shaft I36 (see Figures 5, 11 and 12) i t The clutch is engaged by the shifting of the lever I50 toward the fly-wheel I35.;'Il1is operation is performed as shown in Figure 13 by depressing the handle I52 on the lever I 53. Lever I53 -is pinned to the short shaft I54 I on which is fastened thelever I56. Lever I56-is provided at its lower end with an inclined closed cam groove I53 (Figures 13 and 14).,into which the barrel-shaped roller I65 engages or projects. Roller,l60 turns on a pin I 6| which secures the short bracket I62 to the shaft I63 to which the lever I50is also secured. .Therefore, when the lever-l 53 is-depressed, the lever I56 and its camv I5-8 will act through the roller I60 to move theshaft I63 axially toward the fly-wheel I35 andengagethe clutch ele- Inentsv I45 thereby connecting the fiy-wheel with theshaftl30.. ,The. lever I56 has an arm I6 6 extending toward the right and atits extremity I61 is suspended the bell. crank I68 on the pin Isfl and an; extension. spring I 10 .tends to hold the pin I l I which is secured to one end of the bell crank I68 against the extending arIn I66 of the lever I56 (Figure thereby disengage the clutch-. Crank '95is keyed tothe crank shaft or is actually welded thereon, and the crank pin 95a is pressed into the crank 95; the clutchthrow-out piece-I82 is secured to the crank pin 95a soas to movetherewith but is not rotatabl with respect thereto. 70

Two hand throw-in mechanism for clutch, operation Inlorder to protect the hands of the operator,

some State laws require theoperator to use both 5 hands for the engagement or the clutch so that his hands are occupied at least the beginning of the downward movement, of the 10 during knife and the followingrmechanism is provided. While; the -=right hand is grasping the handle I52,;;(F'igure -l3) his left hand will take hold of the knob I and give its. slight clockwise movement 'Ifhis; will turn the shaft IBI (Figure 13 and especially 8) into-which a small pin I93 is inserted. This pin rests against the outer end o-f:thebottom of the link I96 having notch I91. The opposite end of link I96 is pivoted on pin 200 of arm 20I of the lever I56.

The shaft 26 on which the bell crank 2| freely,rotates,-=is provided with'a 90.ledge 20 3 with which the,notch,,l91 of .the link I'96 engages. Whfintheknob I90 is. turned in a clockwise direction,, the pin.v I93 willliftthe link I96 out of engagement, with the. ledge 203 and thereby permit the oper-ator to depress the lever I53-for th normal engagement of. .the clutch. Crank shaft BIlmay now rotate to operate the knife and clamp mechanism. Buton completion of the cycle member 432 will strike roller I30 on bell crank I68 carried by lever, I56 and will rotate lever l'56counterclockwise about its pivot I54: to reset notch lill of link I56 on ledge 263 to prevent a repeat operation.

Safety pin meehdnism to prevent repeatoperation -The arm I50 is provided with the-integral extension 265 Figures11,-L2and 15) theendof which isforked at zfldtostraddle the safety pin 255,.which-projectsinto a boreZIl of the column casting I 6.; Springs 2 I 0 on 1 either; side of the forked extension-265;locate-s the pin 206 by means of the nut 2 I2.-and;-cotter pin 2I3; A disc 2I5 is fastened to the safety pin 206; To the. outermost end ofthe-crank shaft; 60 is secured-thecam220 having inclined surfacez 21 ,and when the clutch isengaged, the safety; pin-236 moves toward the ifl-y wheel and is thereby withdrawn from'a collisionwith the lug-222 on the internal gear 66,

butgafter the internal gearhas rotated through cam 225, will contact the disc ZI5 and push the safety piniiifi back in again so that shouldthe internal.gear-.-66commence to make a second revolution, the lug 222 will strike against the safety pin 266 and thereby prevent any further turningbf the internal gear-66 which of course means the stoppage of the movement of the knife. When the operator is, inthe process of attachinga new knife or removing adull one, he resorts to what isknown as, inching the machine; that is, he throws the. clutch in by hand and throws it out quickly again and in so doing, he may reach a point whereby the projection or lug 222 would still coaston tovthe safety pin and thereafter prevent him from re-engaging the clutch again because the safety pin could not then be withdrawn. In order to avoid ,such a possibility the arm 23! is provided. This arm is piyoted on thepin 23| which is fastened to the internal gear 56 and this, arm 23!! is urged against the lug 222 by the spring 233. Spring 233 presses against theshoulder 235 of the spring guide pin 236 which rests against the pin 231 also fast in the internal gear. 3 t v a So while the operator is" inching the machine over its range of motion whenever the safety pin is withdrawn, the arm 230 will then prevent'the safetypin from moving inwardly so that the op: erator can. inch the machineover the range when the lug 2221s approaching the safety pin.

After the cam 220, having rather a short surii face, has pushed the safety pin 205 in by acting on the disc 2I-5, the latter is held in this inward position by the latch 243 which drops in behind the disc H5 and thereby holds the safety pin 266 in its innermost position. The latch 256 is fulcrumed on pin 24l fastened in column II]. The cam face 2 35 is provided on the lever I50 so that when the clutch is thrown out, this cam 255 will contact the tail of latch 240 and unlock the disc 2I5 on the safety pin 266 so that on the next engagement of the clutch, the pin 206 can be withdrawn. 7

BRAKE MECHANISM Referring now to Figures 16 and 1'1, the long drivin pinion I33 which is free to turn on the drive shaft I36 has secured to it the brake wheel 250 of the V type having the annular V groove I. Two brake shoes 253 are pivoted on the pin 255 which is secured to the column casting I6 and these brake shoes are held in place by washer 256 and cotter pin 251. The upper end of the right-hand brake shoe is provided with a pin 266 having a threaded opening 26! and the lefthand brake shoe has at its upper end a pin 263 with a drilled smooth hole 26 through which the brake tightening rod 266 passes; the threaded end of rod 266 screws into the opening 26I in pin 266.

A spring 210 has one end pressing against the upper end of the left-hand brake shoe 253 and the other end of the spring pressing against the knob 21I which is fastened to the brake tightening rod 266. The amount of braking force is therefore controlled by the amount of tension that is applied to the compression spring 216.

Suspended or hinged from the member I62 which carries the barrel-shaped roller I66 on the pin I6l as previously described, the brake spreading arm 213 contacts the rollers 21 3 free to turn on pin 215 and secured in each of the brake shoes 253 so that when the clutch is engaged, that is, when the shaft I63 is moved to the right, the cam surfaces on the brake spreader 213 will force the brake shoes out of engagement with the brake wheel so that the brake is released upon engagement of the clutch; and the brake is re-engaged when the shaft I63 moves to the left, that is, when the clutch is being disengaged.

OVERLOAD RELEASE MECHANISM Because the clamping pressure is dependent upon the resistance that the knife meets in its cutting movement, the amount of power eventually required as the knife gets dull correspondingly increases and would then overload the driving gears to such an extent that breakage may result. In order to avoid this, an overload device is provided which consists of the driving drum 280, which is keyed by means of the key 28l to the drive shaft I30 and is located by the dog point set screw 282.

Attached to this driving drum 289 is the driving cam 283. This driving cam 283 comprises a circular ring and is provided with three V-shaped notches 234. Two spaced driving plates 285, 286 are secured to the hub of the pinion I33 and these driving plates 285, 286 have three radial slots 288 and six transverse short horizontal elongated slots 289.

A roller 290 on a pin 292 rests in each of the notches 284 of the driving cam 283. Toggle links 293 fit over each of the pins 292; the other ends of the toggle links 293 carrying pins 295 which engage the short transversely elongated slots 289. Extension springs 36!] connect these latter pins 295 on the ends of the toggle links 293 whereby the tension of these extension springs through the toggle links 293 press the roller 296 into the notches 285 of the driving cam 283.

However, if the torque exceeds a certain amount depending upon the strength of the springs 360, and whenever this torque is exceeded, the rollers 290 Will begin to climb up the inclines defining the notches of the driving ring cam 283 and then will reach a location wherein the toggles no longer form an angle less than 180 but will actually pass through a straight line and then bend in the opposite direction, passing through center; then, of course, the tension of the springs 306 will make the rollers 230 snap over to the other side of the cam 283 and the driving power is then completely disengaged from the drive shaft I36. One link 293a of each of the three sets of teegle links is provided with an extension 2931). These extensions will project beyond the periphery of the driving cam 283 whenever the driving rollers 299 have become disengaged and one of these extensions will strike lug 362 of the brake spreader 213 so as to disengage it from the rollers 214 of the brake shoes 253 thereby applying the brake and stopping all motion.

Whenever this disengagement occurs, the operator should then locate the cause of such disengagement which might be due to the knife being too dull, a frozen bearing, or some other difficulty. The overload device after examination .of the machine can be re-engaged by depress- SUMMARY OF OPERATION My novel paper cutter is thus so arranged that it includes a clamping mechanism which may be foot operated or power operated, and more particularly a clamping mechanism which is operated to exert pressure proportional to the load encountered by the knife in going through the stack. Thus instead of requiring an adjustment by the operator based solely on the operators judgment, a compression spring provides for initial clamping pressure of minimum amount and the final clamping pressure is provided and automaticall adjusted in accordance with the quality of material, the dullness of the knife and the height of the pile. An adjustment is also provided for the initial spring biased clamping pressure.

My novel paper cutter also includes a simplified knife construction with simple and readily accessible adjustable means for maintaining the knife blade parallel at all times. Specific separate guide members are also included both for the knife and for the clamp so that these elements are always under perfect control.

The guide means for the clamp include a rectangular tubular guide located in the auxiliary housings at the'top of the machine; this guide being open at its inner face above the working level of the machine in order to permit the clamp extension to enter the guide on each side. The guide is fully enclosed in the working area of the machine to prevent the pull bars or other opcrating elements of the clamp from aifecting the paper and also to .prevent the lodging of paper in the guides. This enclosed area extends up almost, but just short of, the uppermost level squeezes the'pa er by' ineans of the'i 13 hithe -clamping su-fface-oftheflamp when 'ra-i'se'd. 'The'g'uide is itself provideewitnsut ntial openings 'at 'a 'portion' tliereof facifigaway from "the table in' order to" 'prniit izis'zibii of the operation of the un bars and" fte'r balancing springs on "eaeh side'and in order to facilitate e1eam'n thereof Without dismantling the machine.

' I'heknife-"guide memliers are adjustable i nl'ord'e'r to aligh'the knife blade vertie'allyin proper operatin position. Thus the e'ciiefitlic iiin 89- of Figure is utilized 'toad j'u'st the Knife with r'espent to a tilt or canting in a vertical'plane," While the guide elements of Figure 9 61'1" ea'h' side 'a-re arranged to "adj ustjthe'k'nif e with pect to ave merit of the edge thereof-in a ho'rizohtal 'plane "to adjust this edge so that the entire knifeblade is perfectly Vertical The drivingmeclianisni is integrated w'ithiboth the operating meohanisnifor the cIamIY a-nd the op'erating'meehanism for the li'ni'feiii meet that these operations proceed in prbper sequ'efifial timing. The clamp-is broughtdown 'arid initially provided by sfir'ing'ifl. AS thekni 5, reaction Of the knife driving eleifients to the 16253 encountered by the'k nife in going mitten-tee My pap'er'eutt'er also provided with a riot-e1 safety pin mechanism td'preve'nt' a repeat" para tion' thereby fu'fthr 'proteting the use tor against any'po'ssibiiit thatthe 9 will ee scene While he is' renamin a portion of 'a" Gilt pile.

"My paper cutter isalSdp'i OVided Wit-11 a have; brake mechanism which willautor'nati allyha'lt the knife in itsa eratien or reiase' f6i p'I'a-j tion'simultaneously with the operation oi the clutch niember. 1

Finally and owing to the fact that the-full clamping pressure is determined byithe'lo en countered by the knife and that'this-piessfiTe constantly increases as the knife beoiiies fnor and, more dull, I provide an overload release mechanism which will" halt the cperatien "o" linife'whentlie loadencountered by the kn ife In 'operatioma pile of paper is'plac'ed-"d 'i-tfiebed or euttingta'ble i=3 and isappfOpriatel'Y so that the line of out is 'dir'e'etly underth'e blade '88-. Theo'pei a'tor maythendepr'ess th press the: paper pile down temporarily to" mate rew raiter ahdjust beneath theknife edge. lie'then removes his foot-from pedal The pedal" isfthen returned by the spring]; andthe elamp is "returned to its upper position by; the counter balancing springs; 33. He then operates handles 152 and 190 of Figure 13 simultaneously. Handle I90 releases themechariism for operation and handle I52 actually performs thefopera'tion of inter-engaging the olu'teh elements iof the fly; Wheel clutch 1 35. This Connects the driven pulley I38 throughthe fly wheel clutoh I to the main drii/e shaft I30 and the clamp is thenb-rought down on to the paper pile being pressed intofengagement as above d'e'scribed under the influence and control ofcoinpression spring 10. The 'kni fe 81 is brought downiinmediately after the elanrip l4 and begins togn throf1ghthe paper. As previously des'igi'ibed, the reactiorijoi the knife blade to the load whiehis eincountered in going through the paper is carried back to the clamp operating-mechanism to cause the clamp to press more tightli 'inproportionto the load. In the event that the load encountered by the driving elements becomes too great owing toprogressive dulling'of the knife, thenthe oi erload release mechanism sham lifigurias 16 and 17 dis-'- eonnects the driving elements and brings "the machine to a stop.

- mime i r qae we, e's' rit b dpmyi men tion solely in connect-ion yvith'preierred illustra ti've embodiments threof sinoe many varia-,,

tions and in'odi fieation my invention will no be apparent to theses filed in the art I p'ref ir to b'e'boi'ind' not by the specifio displosures heiin contained lout'ori'li by the appended clainis.

. i m-a 1. In a paper} outterihaiiinga hoifl'izontaltabl'e t up-port a stab of paper to beltut, a .clainpand knife placed fortt ard'of said ame, saidfolainp and knife being rn'ounted above said table and hitting down toward said table ior cutting and up f ioinlsaid table at the endof the eutting stroke; operating means for said knife and op'f er'atiiigrneans for said clamp, and an additional eonnetionbetween the operating ine'ans iorthe knife and the operating ineans forfthe clamp to transniitl'tothe clamp a downward force thereon proportional to the resistance encountered b3} the knife" in'entering and going through thepaper t e s t 2.111 2;- pap'eroutter having a horizontaltable to support a stack of paper to be cummgvmp and ak'nif' pieced forward of said olamphsa id clamp and'kn'ifebeing mounted above said table 'anld moving down towardsaid'table for outt'ing and up way from-said table at the end of the out; tingstrokey means for operating said clamp and knife to cause said cilarnplto engage said paper stack and saidfiliniie to through said paper staki and' me'ans interconneeting said knife and saidclarhp to vary the pressure of'said clan p on said paper stack in acoordance with the resistanee encountered by the knife'in entering andeutting' throughsaid paper stak; "andfadditional mea s;

able? rati-tig said clamp and knife; a tonnectionbe tween said operating means and said source of power; and automatic means for increasing the clamping pressure in accordance with the resistance encountered by the knife in going through the paper stack; and overload release means for breaking the connection between said source of power and said operating means when the resistance encountered by the knife exceeds a predetermined amount 4. In a paper cutter having a horizontal table to support a stack of paper to be out, a clamp and a knife placed forward of said clamp, said clamp and knife being mounted above said table and moving down toward said table for cutting and-up away 'from said table at the end of the cutting stroke; a source of power; means for operating said clamp and'knife; a connection between said operating means and said source of power; and overload release means for breaking the connection between said source of power and said operating means when the resistance encountered by the knife exceeds a predetermined amount.

5. In a paper cuter having a work supporting member; a vertically reciprocable clamp; a lateral extension from said clamp; a pull bar connected at its upper end to said lateral extension; a bell cranklever; the lower end of said pull bar being connected to one arm of said bell crank lever; a foot treadle; a connection from said foot treadle to the other arm of said bell crank lever; said bell crank being rotated to pull down said pull bar and clamp when said treadle is depressed; additional means for operating said clamp to lower the same; the connection between said foot treadle and said bell crank lever being broken when said clamp. is lowered by said additional means.

6. In a paper cutter having a work supporting member; a vertically reciprocable clamp; a lateral extension from said clamp; a pull bar connected at its upper end to said lateral extension; a bell crank lever; the lower end of said pull bar being connected to one arm of said bell crank lever; a foot treadle; a flexible member connected at one end to said foot treadle; means for yieldingly supporting the opposite end of said flexible member; said flexible member being moved longitudinally when said foot treadle is depressed; an abutment on said flexible member aligned with the other arm of said bell crank lever; said abutment engaging said other arm and rotating said bell crank lever when the foot treadle is depressed to pull down said pull bar and clamp.

7. In a paper cutter having a work supporting member; a vertically reciprocable clamp; a lateral extension from said clamp; a pull bar connected at its upper end to said lateral extension; a bell crank lever; the lower end of said pull bar being connected to one arm of said bell crank lever; a foot treadle; a flexible member connected at one end to said foot treadle; means for yieldingly supporting the opposite end of said flexible member; said flexible member being moved longitudinally when said foot treadle is depressed; an abutment on said flexible member aligned with the other arm of said bell crank lever; said abutment engaging said other arm and rotatin said bell crank lever when the foot treadle is depressed to pull'down said pull bar and clamp; said means for yieldingly supporting the opposite end of said flexible member returning said flexible member and said foot treadle to the original position when the foot treadle is released.

8. In a paper cutter having a Work supporting member; a vertically reciprocable clamp; a lateral extension from said clamp; a pull bar connected at its upper end to said lateral extension; a bell crank lever; the lower end of said pull bar being connected to one arm of said bell crank lever; a foot treadle; a member connected at one end to said foot treadle; means for yieldingly supporting the opposite end of said member; said member being moved longitudinall when said foot treadle is depressed; an abutment on said member aligned with the other arm of said bell crank lever; said abutment engaging said other arm and rotating said bell crank lever; when the foot treadle is depressed to pull down saidpull bar and clamp; said means for yieldingly supporting the opposite end of said member returnin said member and said foot treadle to the original position when the foot treadle is released.

9. In a paper cutter having a work supporting member; a vertically reciprocable clamp; a lateral extension from said clamp; a pull bar connected at its upper end to said lateral extension; a bell crank lever; the lower end of said pull bar being connected to one arm of said bell crank lever; a foot treadle; a flexible member connected at one end to said foot treadle; means for yieldingly supporting the opposite end of said flexible member; said flexible member being moved longitudinally when said foot treadle is depressed; an abutment on said flexible member aligned with the other arm of said bell crank lever; said abutment engaging said other arm and rotating said bell crank lever when the foot treadle is depressed to pull down said pull bar and clamp; additional means for operating the clamp to lower the same; said bell crank lever rotating free of said abutment under the influence of said additional means.

10. In a paper cutter, a table for supporting a stack of paper to be cut, a clamp mounted above the table and means for moving said clamp toward the table to press down the paper stack and for returning said clamp to raised position, said means including a pull bar; a lateral extension from the side of the clamp; said pull bar being connected to said extension; said extension being elevated above the lower face of the clamp by a distance greater than the maximum working stroke of the clamp from its uppermost position to the table; a guide for said extension; said uide including a vertical member of substantially U-shaped cross-section mounted at the side of the table with the open side of the U toward the table and receiving said extension; an opening in said U-shaped member at a portion thereof spaced from said open side of the U; the interior of said U-shaped member being visible through said opening.

11. In a paper cutter, a table for supporting a stack of paper to be cut, a clamp mounted above the table and means for moving said clamp toward'the table to press down the paper stack and for returning said clamp to raised position, said means including a pull bar; a lateral extension from the side of the clamp; said pull bar being connected to said extension; a guide for said extension; said guide including a vertical member of substantially U-shaped cross-section mounted at the side of thetable with the open side of the U toward the table and receiving said extension; an opening in said U-shaped member at a portion thereof spaced from said open side of th U; the interior of said U-shaped member bein visible through said opening.

12. In a paper cutter, a table for supportin a stack of paper to be cut, a clamp mounted above the table and means for moving said clamp to- 

